avr/led.c

   1
   2 #include "led.h"
   3 #include <util/delay.h>
   4
   5 //The DDRs of the led matrix outputs are set in the mux loop.
   6 void led_setup(void){}
   7
   8 #ifdef HAS_LED_SUPPORT
   9
  10 void swapBuffers(void){
  11     uint8_t* tmp = frameBuffer;
  12     frameBuffer = secondFrameBuffer;
  13     secondFrameBuffer = tmp;
  14 }
  15
  16 void setLED(int num, int val){
  17     if(num<32){
  18         frameBuffer[num>>3] &= ~(1<<(num&7));
  19         if(val)
  20             frameBuffer[num>>3] |= 1<<(num&7);
  21     }
  22 }
  23
  24 void led_loop(){
  25     uint8_t row = 2; //selects the currently active "row" of the matrix. On the protoboards I make, this actually corresponds to physical traces.
  26     for(int i=0; i<7; i++){
  27         uint8_t DDRQ = frameBuffer[i];
  28         uint8_t Q = ~DDRQ;
  29         Q |= row;
  30         DDRQ |= row;
  31         row <<= 1;
  32         led_output_stuff1(Q, DDRQ);
  33         _delay_ms(1);
  34     }
  35 }
  36
  37 //this scary construct is in place to make the compiler happy. if you know a better way, feel free to improve.
  38 uint8_t _frameBuffer[] = {0,0,0,0,0,0,0};
  39 uint8_t _secondFrameBuffer[] = {0,0,0,0,0,0,0};
  40 uint8_t* frameBuffer = _frameBuffer;
  41 uint8_t* secondFrameBuffer = _secondFrameBuffer;
  42
  43 #else//HAS_LED_SUPPORT
  44
  45 void led_loop(){}
  46
  47 #endif//HAS_LED_SUPPORT